TY  - RPRT
TI  - Quantum phase transitions and the extended coupled cluster method.
AU  - N E Ligterink
AU  - N R Walet
AU  - R F Bishop
PY  - 2001
DO  - 10.1103/physreve.63.037103
UR  - https://pubmed.ncbi.nlm.nih.gov/11308801/
ID  - 11308801
ER  -